Hi Timothy,
I don't have a ready answer on AN surgery with Kaiser, but I know there are members here who use Kaiser, so they may be able to answer that. There have also been a few posts on failed radiation, including CK, though fortunately not very many.
My first suggestion would be to start a new topic, rather than posting on the end of this one. That will let more people see it, and you will be more likely to get some useful answers. First click on the title of the section you want to post in, such as Inquiries, or Radiation, or Microsurgery. Then click the New Topic button - it is located on the right hand side at the top. Then enter a subject, and make your post.
Don't be shy, that's what the forum is here for. And welcome to the forum, while I'm at it.
By the way, going from 20 to 23 mm is not a big change by most standards, it might just be some late swelling, or a variation in the MRI. Often they want to confirm growth with a second MRI, before doing anything else.
Steve